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Batteries consist of an ideal source of potential dissimilarity in series with a small resistance. The electrical energy of the battery is produced with chemical reactions that occur in the battery. But, these reactions also result in a small resistance that, unfortunately, cannot be completely eliminated. A flashlight contains two batteries in series. Each has a potential dissimilarity of 1.50 V and an internal resistance of 0.200 \Omega. The bulb has a resistance of 22.0 \Omega.
1. What is the current during the bulb?
2. How much power does the bulb dissipate?
3. How much greater would the power be if the batteries had no internal resistance?
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